tekmar 362 Mixing Control Installation - Manual (Page 12)

12 of 36 Copyright © D 362 -12/08
8 7 9
Increasing Slab Core
Temperature
Decreasing Air Temperature
Constant slab surface temperature
surface
temperature = 35°F
core (sensor) is warmer
Item Menu
° F °
1
DH
View
h
Open 2
1
%
REMOTE START / STOP MODULE 039
A Remote Start / Stop Module 039 can be used to start and stop the snow melting system and
adjust the running time. Refer to data brochure D 039 for details of operation.
REMOTE DISPLAY MODULE 040
A Remote Display Module 040 can be used to start and stop the snow melting system. The
snow melting system is enabled by pressing the Up button on the 040 while in the View menu.
Once the snow melting system is enabled, the word STRT is displayed in the LCD for at least
five seconds. The 040 then displays the Run Time setting to allow the user to adjust it.
To disable the snow melting system when it is in the melting mode, press the Down button on
the 040 while in the View menu. The word STOP is displayed for five seconds.
Section C3: With Slab Sensor (Mode —2—)
SLAB OUTDOOR RESET
A slab sensor maybe installed to provide more accurate temperature
control. The control assumes that the sensor is approximately 1 inch below
the surface of the snow melting slab. Since this point is closer to the source
of the heat, this point is warmer than the surface of the slab. Therefore, the
sensor must be maintained at a higher temperature in order to ensure that
the surface of the slab is maintained at the correct temperature. The
amount of temperature difference between the surface of the slab and the
slab sensor changes with the outdoor air temperature. Therefore, the slab
core temperature is increased as the outdoor air temperature drops. The
temperature displayed as the slab temperature is the temperature of the
slab sensor. This sensor temperature is higher than the surface tempera-
ture of the slab.
IDLING MODE (IDLING)
When the snow melting system starts from a cold temperature, the time required for the slab to reach the “Melting” temperature may
be excessive. To decrease this start up time, the slab can be maintained at an “Idling” temperature. The idle feature is also useful for
preventing frost and light ice formation. When the control is in idling mode, the
Idling pointer is visible in the View menu and the word
IDLEcan be read when looking at the SNOWMELTitem in the View menu. The IDLING setting in the Adjust menu sets the slab surface
temperature that is maintained while the control is in the idling mode.
MELTING MODE (MELTING)
The Mixing Control 362 is a manual snow melting control. In order for the snow melting system to be started, one of the three methods
described in section C2 must be used. When the control is in the melting mode, the
Melting pointer is visible in the View Menu and either
EXT, INF or a running time can be read when viewing the SNOWMELT item in the View menu.The MELTING setting in the Adjust Menu
sets the slab surface temperature that is maintained while the control is in the melting mode.
m o d e .
Section C4: Without Slab Sensor
In cases where a slab sensor has not been or cannot be installed in the snow melting slab, it is possible for the Mixing Control 362
to operate the snow melting system. This mode of operation is not recommended since the control can no longer regulate the
slab temperature. This method of operation can cause the slab to operate at surface temperatures that are higher than required. A
higher surface temperature can lead to excessive energy usage and fuel costs. The sequence of operation for the control when it is
operating without a slab sensor is the same as described in sections C1 and C2.
However, the following items change as described:
RUN TIME
As there is no slab sensor, the RUN TIME clock does not wait for the slab to reach MELTING temperature to start counting down,
but instead starts counting down as soon as the control starts the melting operation.